1. A>C 2. (A*C)>H /A>H | 3. A ACP (assumption for conditional proof) | 4. C 3,1,MP (modus ponens) | 5. A*C 3,4,Conj (conjunction of two premises) | 6. H 2,5,MP (modus ponens) 7. A>H lines 3-6 CP (conditional proof) Edwin